The content discusses the use of multimethod geophysical modeling for granite-related tungsten exploration in the Puy-les-Vignes/Saint-Goussaud district in the Limousin region of France. The key points are:
The Limousin region has produced significant amounts of tungsten, tin, gold, and uranium ores, with the mineralization spatially and temporally associated with evolved leucogranites.
The Puy-les-Vignes deposit, the most important tungsten deposit in the region, has no clear geophysical footprint, making exploration of hidden deposits challenging.
The researchers compiled geological and geophysical data, including airborne magnetic, electromagnetic, and gamma-spectrometric surveys, as well as ground-based gravimetric data, to build a 3D geological model of the area.
Lineament analysis of the electromagnetic data revealed a 3D lineament network, with the most frequent direction oriented N135°, which does not match the mapped faults in the area.
Resistivity grids from the airborne electromagnetic survey identified anomalous low-resistivity zones, which could represent deep hydrothermal alteration corridors associated with vertical permeable conduits.
The multimethod geophysical modeling allowed the researchers to model the geometry of the Saint-Goussaud and Auriat granites, suggesting the presence of potential granitic cupolas where mineralization could be localized.
The combined geophysical and geological data suggest the existence of unexposed granitic cupolas around the Saint-Goussaud and Auriat granites, which could be responsible for the numerous tungsten-tin occurrences and geochemical anomalies at the surface.
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